Practice A



Practice A

Identifying and Writing Proportions

Write the ratios in simplest form. Determine if the ratios are proportional by comparing them.

1. [pic], [pic] 2. [pic], [pic] 3. [pic], [pic]

4. [pic], [pic] 5. [pic], [pic] 6. [pic], [pic]

7. [pic], [pic] 8. [pic], [pic] 9. [pic], [pic]

10. [pic], [pic] 11. [pic], [pic] 12. [pic], [pic]

Find an equivalent ratio. Then write the proportion.

13. [pic] 14. [pic] 15. [pic]

16. [pic] 17. [pic] 18. [pic]

Practice B

Identifying and Writing Proportions

Determine whether the ratios are proportional.

1. [pic], [pic] 2. [pic], [pic] 3. [pic], [pic]

4. [pic], [pic] 5. [pic], [pic] 6. [pic], [pic]

7. [pic], [pic] 8. [pic], [pic] 9. [pic], [pic]

10. [pic], [pic] 11. [pic], [pic] 12. [pic], [pic]

Find a ratio equivalent to each ratio. Then use the ratios to write a proportion.

13. [pic] 14. [pic] 15. [pic]

16. [pic] 17. [pic] 18. [pic]

Practice C

Identifying and Writing Proportions

Determine whether the ratios are proportional.

1. [pic], [pic] 2. [pic], [pic] 3. [pic], [pic]

4. [pic], [pic] 5. [pic], [pic] 6. [pic], [pic]

Find a ratio equivalent to each ratio. Then use the ratios to write a proportion.

7. [pic] 8. [pic] 9. [pic]

10. [pic] 11. [pic] 12. [pic]

Complete each table of equivalent ratios.

13. 4 CDs to 10 tapes

|CDs |2 | |10 | |28 |

|Tapes | |10 | |30 | |

14. 9 triangles per 6 circles

|Triangles | |9 | |30 | |

|Circles |2 | |8 | |50 |

Find two ratios equivalent to each given ratio.

15. 10:21 ________________________________ 16. 15:8 ________________________________

17. [pic] ________________________________ 18. [pic] ________________________________

Problem Solving

Identifying and Writing Proportions

Write the correct answer.

1. Jeremy earns $234 for 36 hours of work. Miguel earns $288 for 40 hours of work. Are the pay rates of these two people proportional? Explain.

3. The ratio of adults to children at a picnic is 4 to 5. The total number of people at the picnic is between 20 and 30. Write an equivalent ratio to find how many adults and children are at the picnic.

2. Marnie bought two picture frames. One is 5 inches by 8 inches. The other is 15 inches by 24 inches. Are the ratios of length to width proportional for these frames? Explain.

4. A recipe for fruit punch calls for 2 cups of pineapple juice for every 3 cups of orange juice. Write an equivalent ratio to find how many cups of pineapple juice should be used with 12 cups of orange juice.

Choose the letter for the best answer.

5. A clothing store stocks 5 blouses for every 3 pairs of pants. Which ratio is proportional for the number of pairs of pants to blouses?

A 15:9 C 12:20

B 3:8 D 18:25

7. The town library is open 4 days per week. Suppose you use the ratio of days open to days in a week to find the number of days open in 5 weeks. What proportion could you write?

A [pic] ( [pic] C [pic] ( [pic]

B [pic] ( [pic] D [pic] ( [pic]

6. To make lemonade, you can mix 4 teaspoons of lemonade powder with 16 ounces of water. What is the ratio of powder to water?

F 4:32 H 24:64

G 32:8 J 32:128

8. At a factory, the ratio of defective parts to total number of parts is 3:200. Which is an equivalent ratio?

F 6:1000

H 30:1000

G 150:10,000

J 1,000:10,000

Reading Strategies

Compare and Contrast

A proportion is two equal ratios.

Here are two ratios: [pic] and [pic]

To find out if they are equal, reduce ratios to simplest form.

[pic] ( [pic] [pic] ( [pic]

[pic] and [pic] are equal ratios. They form a proportion.

Read: “6 is to 8 as 9 is to 12.”

Compare these two ratios: [pic] and [pic].

These ratios are in simplest form, but they are not equal.

[pic] ( [pic]

[pic] and [pic] are not equal ratios. They do not form a proportion.

Use the ratios [pic] and [pic] to answer Exercises 1–3.

1. Reduce [pic] to simplest form. ________________

2. Compare [pic] and [pic]. Are they equal ratios?

3. Do these two ratios form a proportion? Why or why not?

Use the ratios [pic] and [pic] for Exercises 4–6.

4. Reduce [pic] to simplest form. _________________

5. Compare [pic] and [pic]. Are they equal ratios?

6. Do [pic] and [pic] form a proportion? Why or why not?

[pic]

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LESSON

4-3

LESSON

4-3

LESSON

4-3

LESSON

4-3

LESSON

4-3

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